Zte AT&T GR225 User Manual page 14

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cochlear implants), users may detect a buzzing, humming, or whining noise.
Some hearing devices are more immune than others to this interference
noise, and phones also vary in the amount of interference they generate.
The wireless telephone industry has developed ratings for some of their
mobile phones, to assist hearing device users in finding phones that may be
compatible with their hearing devices. Not all phones have been rated.
Phones that are rated have the rating on their box or a label on the box.
The ratings are not guarantees. Results will vary depending on the user's
hearing device and hearing loss. If your hearing device happens to be
vulnerable to interference, you may not be able to use a rated phone
successfully. Trying out the phone with your hearing device is the best way to
evaluate it for your personal needs.
M-Ratings: Phones rated M3 or M4 meet FCC requirements and are likely to
generate less interference to hearing devices than phones that are not
labeled. M4 is the better/higher of the two ratings.
T-Ratings: Phones rated T3 or T4 meet FCC requirements and are likely to
be more
usable with a hearing device's telecoil ("T Switch" or "Telephone Switch")
than unrated phones. T4 is the better/higher of the two ratings. (Note that not
all hearing devices have telecoils in them.)